Should I have invited her ?

So basically my birthday was a week ago, & I have this friend (V) who did a lot for me. She bought me presents, decorated my locker (we're seniors in high school), bought me lunch, & had the principal say happy birthday to me over the loud speaker. She was beyond a good friend to me.

Anyways, always around my birthday me & my two other friends (J & L) get together. J is in a grade below us, & L moved away years ago, so I do not see them very often. I wouldn't say it's a birthday party more than it is a tradition really, & a way for us to hang out together at least once a year.

Well anyways, I made plans to hang out with J & L this weekend, but then my other friend (A) who is also friends with V, asked if I wanted to hang out with her & our other friend (K) this weekend. K has a car, sooo A thought that it would be fun if we all went out for the night, & since me, J, L, A, & K all get along, I thought why the hell not.

Wellll apparently it got mentioned in front of V that all of this was happening, & she basically thinks that she was not invited to my birthday party & is feeling left out. & it's like, I feel so bad. She did so much for me on my birthday, but it's not like I meant to not include her, it's just how the plans worked out. & I mean I would invite her, but there's only so much room in the car...

Am I a bad person for not thinking about her in all of this?

(I tried using initials to make it less confusing, sorry if it made it more confusing...)